IS · 3708 ( Put :J ) - 1985

Indian Standard
METHODS OF TEST FOR NATURAL RUBBER LATEX
PART 3 DETERMINATION OF DENSITY

NRL:6

(First Revision)
Rubber Sectional Committee, PCDC 14
CMinnGlI
5BBI LALIT MOH~JAXlfADA8
y~

JUftrlS~

Coamos India Rubber Worla PlOt Ltd, Bombay

SBBJ S.

B. GAN011LI Dunlop India Ltd, Calcutta SJIlU K. S. LOOA!UTlIAN ( .AllmMU )
M",.,s

A B&&KAJl Padinjarebra Agencies Ltd, Kottayam SKBI O. P. AoAllw&L Transasia Carpets Ltd, Sika.ndrabad SJIBI J. N. JIlA( Alunr.u) SBBI A. K.. BANDTOP&DH&YAT Ministry ofDerence (ool) SBBI V. BHA'J"J'AClUBYA ( ~) Da B. BANJIRnal Carbon and Chemicab India Ltd, Cochin Da D . Buo:BJJm EKon Consultants Pvt Ltd, Calcutta On P. S. BHAllOAVA Alkali and Chemical Corporation of India Ltd, Ca1Gutta SBBI N. C. S ....AIDAB ( ~) SKBI J. CaA'l".I'aBlP Andrew Yule & Co Ltd, Calcutta SBlII A. K. BI8'\1t' AS ( .A1lmttIU ) DB D. K. DA8 National Test Home. Calcutta
SBBI S&TIIlIl SKBI A. GBOSIl ( ~)

Smu P. B. G. DAIITJDAB

SKBI S. SARXAB ( ~) Smu S. L GAJI1>HI

Bata India Ltd, Calcutta

Miniary of Defence ( R &: D ) SJDn H. C. han ( A.l-.u ) SJISlJ. M.GAllo Directorate General of Technical Development, New Delhi
(~_,.,.2)

I

CeJ1Jril'" 1985 INDIAN STANDARDS INSTITUTION ThiI publicatioll is protcted under the lrvlia ~1Jt .An (XlV of 1957) aDd nproductiou ia whole or iD pert by any meaua escept with writtea perm_on of the publBber IbaU be d~ to be an infiinpment of copyright UDder the aid Act.

e

IS : 3708 ( Part :I ) · 1985
( CI1I1!inUlti fttmt pl1gl 1 )

MnnlJm IlIj1rlJmtM, SURI A. GEORGE JOHN Madras Rubber Factory Ltd, Madras SRm K. J. JOSEPH Plantation Corporation of Kerala Ltd, Kottayam SaBI K. T . V ARQIlESE ( AI/1r1I1JU ) SUBI G. R. KAVISJrVAB Indian Rubber Regenerating Co Ltd, Thane SBln 1'. S. VIRANI ( Allmtatl) SKRI N. S. KJlAN~.\ All India Rubber Industries At~ocjatjon, Bombay SSRI R. R. P,NDIT (Altml4t, ) SaBI K. N. KosDY M. M. Rubber Co Ltd, Madras Smu N. SUBRAMANIAN ( Altnuu ) SKRI P. K. MADBAVA MI!:N'ON Thirumbadi Rubber Co Ltd, Mokkam SHRI L. K. MATHUR Modi Rubber Ltd, Modipuram SBRI D. W. McCrURICIt A3s0ciation of Planten of Kerala, Cochin SHill P. K. MItNON ( AltmI4t,) SKRI P. K . MENON United Planten' Association of Southern IIldia, Coeneee SHRIE.B.UNNI(Mtmuu) DB W. MILLNS Indian Rubber Manufacturers Researcb AsJociation, Thane SJJRI N. B. FEOADE ( AltmI4t,) . SIlRI R . MUBLEIroHARAN NAm Hindwtan Latex Ltd , BangaJore Bayer ( India) Ltd, Bombay SBRt R. R. PANDIT SHKI D.]. BSABUOBA ( Allmuul) SKRI S. A. PASSA London Rubber Co ( India) Ltd, Madras SHRt R. KRISHNAN ( Altmull, ) 5IIRI M . C. PAUL Arakkunnam Co-operative Rubber Marketing Society Ltd. Arakkunnam 5BBt K. S. R.A.oHAXBISHNAlf National Rubber Manufacturers Ltd, Calcutta SBRI R. P. MATHUR ( AlUmtIU ) SDI A. RU.uAAN! Automotive Tyre Manufacturers' ASIociaticm, New Delhi SKHI P. C. SENOln'TA ( AlImuztI) SBBI RA.lumER Srxna State Trading Corporation of India Ltd, New Delhi SURIO. P. ABOBA ( AlunuJu) In S. B. RATa Synthetics and Chemicals Ltd, Bombay SlIBI H. C. CHOPRA ( AllmtDU ) 5ID11 S. V . sA.RICA Travancore Rubber & Tea Co Ltd, Trivandnun SIDII C. S. KRISJI1USWAIIY (AltmuJU) SBBI SUlfIL I. SlUR Indian Petrochemicals Corporation Ltd, P. O. Petrochemicals, Vadodara SlIBI A. K. MALLIE ( A.ltmuIu ) SDI E. V. TaolliAs Rubber Research IDltimte of lDdia, Kottayam; tIII4 R.ubber Board, Kottayazu Da M. G. KVJU.JL.A.Ir ( AllmItJUI ) . DlI N. M. ~~HJlW ( ~ II ) SlIBt M. S. Sumu, Director GeDeral, lSI ( ~ M-"r ) Director ( P & C )
~
SHBI~Kmun

AllUtant Director ( P&C), 151

(C..n-H.,.ll)

2

IS : 3708 ( Part 3 ) - 1985

Indian Standard
METHODS OF TEST FOR NATURAL RUBBER LATEX
PART 3 DETERMINATION OF DENSITV

NRL:6

(First Revision)
o.
FOREWORD

0.1 This Indian Standard ( Part 3 ) ( Fint Revision) was adopted by the Indian Standards Institution on 8 March 1985; after the draft finalized by the Rubber Sectional Committee had been approved by the Petroleum, Coal and Related Products Division Council. 0.2 Test methods for rubber latex had been originally covered in the following Indian Standards:

F", ruUrntJlrub1Hr UJuJl
IS: 3708 ( Part 1 }-1966IS : 3708 ( Part 2 )-1968f

FDT st"",. bulDllieru rubbn La,"
IS : 4511 ( Part 1 )-1967: Since some of the test methods covered in the above standards were common, the concerned committee had decided some years ago to unify and publish a separate series of methods of test which would be applicable to all types of latices - natural as well as synthetic. Accordingly, the following six test methods had been covered under IS : 9316.
COIlteDt,

-Methocb of tell (or Datural rubber latl'X: Part I Dry rubber content, sludf': demity, total alblinity, KOH-number, mechanical stability, volatile fatty acid _her, III. total nil:rOlen. total copper, total iron, totallDaDpn6e and total aah. tMethocb of test (or natural rubMr latex, Part 2. ptetbods of tests for Ityrene-butadiene rubber ( SBR) latices: Part 1 Determinati_ of dry polYIlle', 'H, demty, residual styreDe, bound Ityrenl' and _p content.

3

IS t 3708 ( Part 3 ). 1985 IS : 9316 Methods of test for rubber latex: Determination of surface tension Determination of viscosity Determination of coagulum content Determination of total solids content Drawing of samples Determination of pH

Part 1-1979 Part 2-1979 Part 3-1979 Part 4-1979 Part 5-1979 Part 6-1982

0.2.1 As a result of further rethinking on the subject, it has now been decided to re-designate the test methods common to natural and synthetic rubber latices as RL series; test methods for natural rubber latex as NRL series and test methods for styrene-butadiene rubber latex as SBRL series. Consequently, test methods for rubber latex have been rationalized into the following three series:
a) IS: 9316 Unified methods of test applicable to both natural an d synthetic rubber latices - RL series; b) IS: 3708 Methods of test applicable to natural rubber latexNRL series; and c) IS: 4511 Methods of test applicable to styrene-butadiene rubber latex - SBRL series.

0.3 The existing Indian Standards under IS : 3708 (Parts 1* and 2f), IS : 4511 (Part It) and IS : 9316 ( Parts I to 6) are being gradually replaced by separate standards under the above three series, designated by the appropriate NRL, SBRL or RL series, respectively. 0.3.1 The methods covered under NRL 13, NRL 14 and NRL 15 of IS : 3708 ( Part 1 )-196/1 which are also under revision, have been proposed to be covered under the RL series in IS : 9316 ( ruuler TI11UUm ).
0.4 In order to facilitate cross-reference, it has been decided to retain the original discrete NRL series numbers assigned to various teat methods in IS : 3708 ( Parts I and 2 ) in the revised parts of IS : 3708. 0....1 For proper referencing of the existing test methods and the DeW methods under revision, a statement showing corresponding methods is given in Appendix A. 0.5 In preparing the above series, the need to align the test methods with the corresponding ISO standards/DISfDP wherever available has also
.Metbocb of test for natural rubber later. Part I Dry rubber ~eut, a1udBe content. density, total alkalinity, KOH-number, mechanic:alltllbility, volatile fatty acid number, ftH , total nitrogen, total copper. total iraQ, total maupnese and total alb. . tMethodi of test for natural rubber latex. part 2. . ~Metho<b of tests for styrene·butadiene rubber ( SBR ) latics: Part 1 Determination of dry polymer, pH, density, residual styrene, bound styftne and IOap content.

4

IS : 3708 ( Part 3 ) · 1985

been taken into account for updating the test methods. In the preparation of this standard, assistance has been derived from ISO 705-1974 'Na~ural rubber hitex - Determination of density', issued by the International Organization for Standardization ( ISO ). 0.6 Density determination is used to calculate the mass of a measured volume of latex in locations where it is not possible to weigh directly. For such purposes it is essential that the density be determined on a latex sample containing the same amount of air as it contained when the volume was measured. Before sampling, the latex is, therefore, allowed to stand for a minimum period of 24 hours to ensure the removal of air bubbles. 0.7 In reporting the result of a test or analysis made in accordance with this standard, if the final value, observed or calculated, is to be rounded off, it shall be done in accordance with IS : 2·1960·.

1. SCOPE 1.1 This standard ( Part 3 ) prescribes a method for the determination of density of natural rubber latex of Heoe« brasilimsis, uncompounded, unvulcanized, and which may contain preservatives and has a total solids content up to 63 percent.

20 TERMINOLOGY
2.0 For the purpose of this test, the following definition shall apply. 2.1 Deasity - The mass divided by the volume at a stated temperature. The units shall be stated.

3. OUTLINE OF THE METHOD
3.1 The density of latex is determined by density bottle method and the A correction is applied, if the temperature of bulk of the latex dift'en from the temperature of sample taken for density determination.
resu1~ is. expressed as glml at a definite temperature.

4. APPARATUS
"I Claemic:al Balance
~ eo··taat TeDlperatare BatJa - accurate to within ±0-2°C and adjustable to a temperature above or below room temperature.

U Deaaity Bot~e - 50-ml capacity :having a ground-glass stopper perforated by a capillary and a ground-glass cap and if desired an nacuredjaclret. "
·Rul. for rOUllding off numerical valu. ( r«lisd ).

5

ISz37.(Pan3)·ues
4.4 Two Coalcal ...... - of at least 200-ml capacity, each fitted with a rubber stopper, a shore glalS inlet tube with a rubber blowing ban at the external end and a glass outlet tube reaching nearly to the bottom of the flask.

S. PllOCEDURE
5.1 Adjust the temperature of the constant temperature bath to the desired temperature. Stir the sample of latex gently without introducing air bubbles. Fill one of the conical ftasb with a suitable amount of the latex and place in the bath. Likewise. partIy fill the second conical flask with freshly boiled distilled water and place in the bath. WeIgh the clean and dry density bottIe with stopper and cap to the nearest 0'001 g and immerse up to ill neck in the bath with the ground-glass stopper in place but not the cap. Bring the density bottle and. the latex and water in the two conical flasks to the temperature of the constant temperature bath. Thi. will require a minimum of about 3 hours in the case of a jacketed bottle and 20 minutes in the case of an unjacketed bottle. First blow a few millilitres of latex from the conical flask containing the latex and discard. Then blow sufficient latex from the conical flask into the density bottIe to fill it completely. Put the stopper in place and wipe the top surface immediately clean, taking care not to remove any latex from the capillary tube. Remove the bottle from the bath and place the ground glass cap on immediately. Dry the outside with the minimum of handling and then weigh the bottle to the nearest 0-001 g. Empty the deQlity bottle and wash free from latex with water. Immerse the bottle again in the bath as before. Fill the bottle with water by blowing from the second conical fIaalc and allow to stand for 5 minutes. Empty the bottle and completely refill, while still immened in the bath by the same procedure. 5.1.1 Put the stopper in place and wipe the top surface immediately dry, taking care not to remove any water from the capillary tube. Remove the bottle from the bath and place the ground glasl cap on immediately. Dry the outside with the minimum ofhandliDg and weigh the bottle to the nearest 0'001 g. The results of duplicate tests shall agree within 0·001 g/mI. 6. CALCULATION 6.1 Calculate the density of the latex from the following formula:

D- Mr.. x D w Mw
where
D
= density of latex at the temperature of the constant temperature bath in glm),

6

IS I 3701 ( Part 3 J· 1985
M L = mass in g of latex in the density bottle, D", = density of water at the bath temperature in glml, and M.., = the mass in g of water in the deDlity bottle. 6.2 If the temperature of the density determination of the sample tubes differs from that ofthe bulk of the latex, apply a correction by calculation, using Table I, as folloWJ:

D=A+B-C
where

D = density -oflatex. .of = deDlity measured at temperature of test, B = correction value from table i>r temperature cif test and DRC of latex, and
C

=

eorrec:tiOIl

lata and

DRC .lates.

vabse from table for temperature of bulk oC

7

j:~ ::;,,-{:;'.i;.(~ %'"l!,'l-:,i";',; l'"';:" ' ~ :, ""::0:':. .o&~.~.j ""

" '-';""

TABLE 1 DEN81TY CONVElUllON VALUBS poa NATCIlAL B1JDBIl ( Clalll' 6.2)
TI:Imm- DPIlTY
ATUBE

unx

CollBIlO'1'IO.

·C

O. W.A.TJm

,...-

20 per-

rlml
(I) 0 2 4 6 8
01)

rl ml
(3)

cent

25 percent

rl ml

50 percent rl ml (5) 0-000 0 0-000 4 0'0008 0'0012 0'0017 0'002 2 0'002 8 0'0034 0'0040 0'0046 0'0053 0'0060 0'006 8 0'0075 O'OOB 3 0'0091 0'0100 0'0108 0'011 7 0'01211 OoOlS 5

· 95 per- 40 per- 45 perc('nt

1'0. DBy
cent

RUBBJIB ColftEHT

rl ml
(6) 0-000 0 0-000 4 0'000 9 0'0014 0'001 9 0'0025 0-003 1 0-0038 0'004 5 0-005 2 0'0059 0-006 6 0'0074 0-Q118 2 0'009 0 0-0099 0'0108 0'011 7 0-0126 0-0135 0'0145

cent

50 percent

IlmI
(7) 0'000 0 0-000 5 0-0010 0'0016 0-0022 0'0028 0-0095 0-004 2 0'0049 0'0057 0'006 5 0'0079 0'0081 0'008 9 0'0098 0'0 107 0-011 6 0'0125 0'0\3 .. 0'0 \44 0'0154

Ilml
(8) 0'000 0 0'000 6 0-0012 0'001 8 0-002 5 0'0032 0-009 9 0'0046 0'0054 0'006 2 0'0070 0-0079 0'008 7 0'009 6 0-0105 0'011 4 0-012 of 0'0139 0-0149 0'0159 0'016 S

sllnl
(9) 0-000 0 0-0006 0-0019 0'002 0 0'002 7 0'0035 0-004 2 0'0050 0-0059 0'0067 0'0076 0-008 5 0'009 4 0'0103 0'0 11 2 0'0122 0-013 I 0-014 1 0-015 I 0-016 I 0'0172

55 percent sImI (10)

------_._--"'"\ 60 per- M perglml
(\1) 0'000 0 0'000 8 0'001 6 0'002 of 0'0032 0'0041 0'00f9 0-0058 0'0068 0'0077 0'008 6 0'009 6 0'010 6 0'0\1 6 0-0126 0'0136 0-0146 0-015 7 0'0167 0-0178 0'0189 Ct:nt CIiDt

.. i 8&
ColI

sImI
(12) 0'000 0 0-000 8 0'0017 o-D02 6 0'0095 0'0044 0-005 S 00052 0'0072 0'008 2 0'0092 0-010 2 0-0112 0'0\22 0-0139 0'0149 0'0\54 0'0164 0-017 5 O 'OIB I> 0'0197

(2) 0-99987 0-999 97 1'000 00 0'9'l997 0-99988 0'999 73 0-99952 0'999 27 0'99897 0'998 62 0'998 23 0'99780 0'99732 0'996 8\ 0'99626 0-99567 O'9Q5 05 0-99440 0'99371 0-99299 0'99224

(4) 0'000 0 0'000 3 0'000 6 0-0010 0'001 f 0'0019 0'002 4 0-0029 0'0035 0'0041 0'0047 0-0054 0-006 1 0'006 8 0'0076 0-008 4 0'0092 0'0100 0-0108 0-011 7 0-012 6

0'000 0 0-000 2 0'000 5 0'000 8 0'001 1 0'00\ 5 0'0020 0-002 5 0'0030 0'0035 0'004 1 0'0048 0'0054 0'006 1 e-crs B 0-007 I> 0-008 3 0-009 \ 0'009 9 0'010 B 0'011 7

0'000 0 0-000 7 0'0014 0'0022 0'0030 0'0038 0-0046 0'005 .. 0-006 3 0-0072 0'008 I 0'009 0 0'0100 0'0109 0'011 9 0-0\2 9 0'0139 0-0149 0-0\59 0'017 a 0'018 I

· !

r

10 12 If 16 18 20 22 24

2R 28

30 32 34 3" !l8 40

APPENDIX ( Claus, 0.4.1 )

A

TABLE SHOWING COIUlESPONDENCE OF THE VARIOUS METHODS OF TEST COVERED IN THE EXISTING IS I 9316 ( PARTS 1 TO 5 )-1979, IS I 9316 (PART 6)1982, IS I 3708 (PART 1 )-1966, IS 13708 (PART 2 )-1968, IS I fSll (PART 1 )-1961 WITH THE REVISION/PROPOSED REVISION OF IS I 9316, IS I 3708 AND IS I fSll

--------_. .
ExIa'rUIO

TJIaT M&'l'BODa

Telt Method
(I)

IS No.
(2)

Part ( Series ) (3)

-.

Pllcnoo.JD> R.J:VJlIJOJf ,------"-----~ IS No.
(4)

R. .AJI:a:1

Seriel (5)

(6)

RL SERIES
CD

DeterminatioD otIUl'lace teJllion Determination of vilcolity Determination of coalJUlum conteDt Determination of total IOlida content Drlwin,otaamplel DetenmnatioD of pH DeterminatiClD oltotal copper Determination of total iron Determination or total maDSlnne
NRL SElU1!S

IS: 9316-1979 Part 1 IS : 9316-1979 Part 2 IS: 9316-1979 Part 3 IS: 9316-1979 Part. IS: 9316-1979 IS: 9316-1982 IS: 3708-1966 IS : 3708-1966 IS: 3708-1966 Fart 5 Fart 6 Part 1 ( NRL : 13 ~ Part 1 ( NRL : 14 Part I ( NRL : 15 )

IS : 9316 Part 1 ( RL : 1 ) IS : 9316 Part 2 ( RL : 2 ) IS: 9316 Part 3 ( RL : 3 ) IS: 9316 Part .. ( RL : .. ) IS: 9316 IS: 9316 IS: 9316 IS : 9316 IS : 9316 Part 5 ( RL : 5 ) Part 6 ( RL : 6 ) Part 7 ~ RL : 7 ) Part 8 RL: 8 ~ Part 9 ( RL : 9

1
I'

Under Reviaion

;

J

Determination oC dry rubber COIltent Determination of Ilud,e content Determination of deQilty Determination of total alkalinity Determination of KOH-number Determination of mechanical atabUity

IS: 3708-1966 Partl(NRL:I) IS: 3708 Part I ( NRL : I ) IS IS IS IS IS 3708-1966 Part I NRL : 5 ~ 3708-1966 Part 1 NRL: 6 3708~1966 Part I (NRL: 7) 3708-1966 Part 1 ~ NRL I 8 ~ 3708-1966 Part 1 NRL: 9

f

IS IS IS IS IS

3708 3708 3708 3708 5708

Part 2 ~ NRL Part 3 NRL Part" (NRL Part 5 ~ NRL Part 6 NRL

5) 6) 7) 8~ 9

i ...... =
toO

.

w

II

.... 'G

,

BsJftDIG 'hft
4

~

T.MIthod
(1)

18: No.
(2)

Pan ( SerieI) (5)

,

h01'OIIKD

REVlIIION (5)

r-

IS: No. (4)

-------. Seriel

RBIIARJ[B

;

(6)

NRL SIllUBS
DetermiDation of volatUe ratty 18: 5708-1966 acid Dumber Determination of total mtrolen IS I 3708-1966 Determiutlon ohotal ub IS I 5708-1966 Determination or boric acid IS: 5108-1968 Determination or malD'lium IS: S7C&1968
SBRL SBIUES

Pan 1 ( NRL : 10) IS: 5708 Part 7 ( NRL : 10) )
Part 1 ( NRL : 16) IS: 5708 Part 9 ( NRL : 16 ) Part 2 (NRL: 17) IS: 5708 Part 10 (NRL: 17)

'art 1 ( NRL : 12) IS: 3708 Part 8 ( NRL: 12)

I I
i
)- Under

i l .
w

..

Pan 2 ( NRL : 18) IS: 5708 Part 11 (NRL : 18) I

0

DetermlDation of dry polym. Determination or d_ty Determination of reaidua1 ItyreDe( volatile \lU&NrateI ) Determination of bound atyr. . Dlltermination of IO&P CODtent

IS : 4511-1967 Pan 1 (SBRL: 1) IS: 4511 Part 1 ( SBRL : 1 ) IS : 4511-1967 Part 1 ( SBRL : 6 ) IS: 4511 Part 2 ( SBRL : 6 ) IS: 4511-1967 Part 1 (SBRL: 8 ) IS: 4511 Part 3 ( SBRL : 8 ) IS: 4511-1967 Part 1 ( SBRL : 9 ) IS: 4511 Part 4 ( SIiRL: 9) IS: 4511-1967 'art 1 ( SBRL : 10 ) IS : 4511 Pan 5 ( SBRL : 10 )

I
I

I

Reviaion

II

· ...

J

IS r 3708 ( Part 3 ) - 1985
(Omlimuti .ft- /'tit' 2 )

Methods of Testing Subcommittee, PCDC 14: I
CottNnn
JU~",

DB S. N.

CHAKRAVARTY

Modi Rubber Ltd, Modipuram

MnnlHrs K. MUSTAFt ( ..tllmt4k to Dr S. N. Cbakravarty ) SJlBr SATl811 Al!aAIIAJr Padinjarelrara Agencies Ltd, Konayam SIIaIP.S.BALA8UBBA~.ur L. G. Balakrishnan & Bros Ltd, Coimbatore SJlRI A. N. BRATTACIIABYA Union Commercial and Indllltrial Co Ltd, Calcutta SHRI B. P AlC'JA ( AltlnlllU ) Smn J. CaA'l"rBB.1EB Andrew Yule & Co Ltd, Calcutta SHKI A. K. BmwA!! (A/tmI4U) SJUn P. K. CHA'l"RBnE Bayer ( India) Ltd, Bombay SJlJU D. J. BJiABUCIIA ( AltmuIu) DB C. K . DA8 National Rubbee ManuCacturus Ltd, Calcutta SHBt R. P. MATlr'lJB (AltmraU) Smu J. M. GAnG Directorate General of Technical DevelopIDent, New Delhi SIIBI G. R. KAVI8JITAR Indian Rubber Resenerating Co Ltd. Thane SHBl P. S. VmANI (AltmuJU) Smn PmIN' L. KmABIWALA Cosmos India Rubber Worb Pvt Ltd, Bombay SHaI S. N . GJIAOOI!l ( AlJmtid# ) SIl1Il K. S. LooAl'fATHAlf Dunlop India Ltd, Calcutta DR S. CHATTOPADIIYAY ( AltmraU) SIIBI P. K. MADJIAVA MpOlI Thirumbadi RUbber Co Ltd, Mokbm SBJ<1 A. K. M.u.a Indian P~troehemicahCorportion Ltd, P.O. PetrocbemlC:ab, Vadodara DB Y. N. SlUBKA ( AltmtaU) DB W. MrLLNS IDdian Rubber Manul3cturen Raearch AIIOc:iatioa. Thane Smu P. L. NAG Ministry ofDefeDc:e (DGI)
SIIRI S.

Smu P. K. PAIN NatiODllI Test Ho_, Calcutta DB S. B. RA'I'JI Synthetics &: CbemiClW Ltd, Bombay SJIBI H. C. CJIo1oJu ( AlUnttzU ) SJlRI S. V. SARKA TravaDCore Rubber &. Tea Co Ltd. Trivaudrum
SJIRI c. S. KBIBBJr£8WAllY SHaI E. V. ThOll....

SJlBIH.L.S~V~AVA(~)

&Imtttu ) Rubber Boazod, Kottayam Da N. M. MATJIJIW ( Al#ruU )
(

SJDIl V. G. ToBSJDtAB SJIBI V. K. SUD (A~)

Polyolefint IadUltriel Ltd, Bombay

Il

INTEIlNADONAL SYSTEM OF UNITS ( 81 UNITS)

.... u...
Qt7.&JI'1'D'Y
UMS'

SYMBOL
m

Leasth
Ma.
TUDe

metre 1d1ocram
M!Coud

ka
A K
cd mol

Blec:trte curran
Thennodynamic: temperature LumiDoUJ intemity Amount of substance lhrppI_ _tary U. . .

ampen keJviD candela mole

Q.UAInT1'T
Plane sUl1e Solid aDlle

UK IT

SYMBOL
rad v

radian

steradian

DedYedUaiu

Q.u AJ(TlTY

UIfI'l'

STIDIOL

D.nlIl'rloJf

r...
BDeru Power
Fhm F1t1ll demity Prequeac:y Electric: condue:taDCe Electromotive force
1'reoIt1ft. ItreII

newtcm

N

N

~

I kg.m{"

joule
_tt

J
W Wb T Ih S V P.

J - I N.m
I W - 11{s IWb-IV.. 1 T - I Wb/m· I HI: _ I e{. (.-1) I S-IA/V I V - I W/A
I P. - 1 N{ml

weber

t'"

henz
siemens volt

paac:aJ